Method and device for maintaining transport address associations for an address translation entity

A method of putting public transport addresses into correspondence by a second device, the method comprising:

• receiving a first message transported using a first transport protocol, the first message having as its source transport address a first public transport address allocated to a first device by a transport address translation entity connected in series between the first and second devices;
• storing the first public transport address in association with the first transport protocol and with correspondence information;
• sending to the first device a response to the first message;
• receiving a second message transported using a second transport protocol, the second message sent in response to the reception by the first device of the response to the first message, the second message having as its source transport address a second public transport address allocated to the first device by the transport address translation entity, such that the transport address translation entity has simultaneously two address associations for the first device, the second message including the correspondence information;
• and
• putting the first public transport address into correspondence with the second public transport address by using the correspondence information.

A first device comprising a processor and a memory storing instructions that, when executed by the processor, cause the processor to:

• send, using a first transport protocol, a first message having a first private transport address to a second device, the first message configured to cause a transport address translation entity placed in series between the first device and the second device to make a first association of a first public transport address with the first private transport address and with the first transport protocol;
• and
• in response to reception of a response to the first message from the second device, send, using a second transport protocol, a second message having a second private transport address to the second device, the second message configured to cause the transport address translation entity to make a second association of said second private transport address with a second public transport address and with the second transport protocol, resulting in the transport address translation entity having simultaneously the first association and the second association, the second message further containing correspondence information that is also contained in the first message and/or in the response to the first message, and that is configured to, once the second device has received the second message, cause the second public transport address to be put into correspondence, using the correspondence information, with the first public transport address at the second device.

A second device comprising a processor and a memory storing instructions that, when executed by the processor, cause the processor to:

• receive a first message transported using a first transport protocol, said first message having as its source transport address a first public transport address allocated to a first device by a transport address translation entity placed in series between said first and second devices;
• store the first public transport address in association with the first transport protocol and with correspondence information;
• send to the first device a response to the first message;
• receive a second message transported using a second transport protocol, the second message sent in response to reception by the first device of the response to the first message, said second message having as its source transport address a second public transport address allocated to the first device by the transport address translation entity, such that the transport address translation entity has simultaneously two address associations for the first device, the second message including said correspondence information;
• and
• put the first public transport address into correspondence with the second public transport address by using the correspondence information.